I had similar problems, though it was more to do with my external family who kept meddling in my family's livlihoods (as we live with my grandparents). My parents are very liberal when it comes to Islam, in the sense that they see it as personal spirituality (thus they stay away from alcohol etc but they dont impose their beleifs on anyone, nor do they automatically dismiss every religion). I myself studied Islam for about 3 months, and found that many of its rulings were in fact imposed by political totalitarians that used religion to control people, a practice still used today.
You need to go to university and experience the world, but you also need to speak to your parents in a mature way. If they want to act like stubborn children, let them, as long as you have made your diplomatic peace, and made it clear why you are feeling depressed. i have a feeling that Islam isnt the problem as such, but rather, cultural ideas, which i sympathise with. For a long time I felt extremely miserable because of it, and as a result I ended up breaking up with my first gf after 3 weeks simply because I was scared what my family would think. Its your life, and if there is any more abuse, its a wise idea to bring in the authorities, they are taking a much stronger stance on cultural abuse now.
I respect your decision to leave Islam, it is a very confusing religion that unfortunately is taught in a dictator-type way (dosent mean its evil, it means that the religion was abused by the first Ummah and beyond), but I feel this is more the case of you needing to form a bridge between ur parents, than a religious matter.